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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details 2) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Property and equipment
Maturity period from date of purchase, short-term investments classified as cash equivalents, less than (in days)	91 days
Capitalized software costs written-off		$ 4,900,000
Net book value	270,512,000	259,588,000
Buildings and leasehold improvements \| Minimum
Property and equipment
Estimated useful lives, minimum (in years)	3 years
Buildings and leasehold improvements \| Maximum
Property and equipment
Estimated useful lives, minimum (in years)	39 years
Capitalized internal use software
Property and equipment
Net book value	$ 33,400,000	$ 29,200,000
Capitalized internal use software \| Minimum
Property and equipment
Estimated useful lives, minimum (in years)	2 years
Capitalized internal use software \| Maximum
Property and equipment
Estimated useful lives, minimum (in years)	3 years
Furniture and other equipment \| Minimum
Property and equipment
Estimated useful lives, minimum (in years)	3 years
Furniture and other equipment \| Maximum
Property and equipment
Estimated useful lives, minimum (in years)	10 years

For each income statement presented, the amount charged to expense for write-downs of capitalized computer software costs to net realizable value.

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- Definition

Amount, net of accumulated depreciation, depletion and amortization, of long-lived physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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